Electroconducting coil



C. W. DUNHAM.

ELECTROCONDUCTING COIL.-

. APPLICATION FILED MAR. 6. 1917.

Patented May 11, 1920.

WITN ESSES may,

rnnrnn @HARZQES WI DURHAM, 0F BUEOUGI-l', PENNSYLVANIA, ASSIGNQE Til T UNIUN SWITCH & SIGNAL GOMLFANY, (315 S" TTQIT 9F PENNSYLVANTA.

'IEESVALE, PENNSYLVANEA, A GQEPFDEfiw ELECTROCQNDUCTTNG CUTE.

Patented May ill, 192th.

Specification of Letters l atent.

Application filed "March 6, 1917. Serial No. 152,765.

To all whom it may concern:

Be it known that I, CHARLES W. DUN HAM, a citizen of the United States, residing at Edgewood borough, in the county of 5 Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Electroconducting-Coils, of which the following is a specification.

My invention relates to electro-conducting coils such as magnet coils, inductance coils or the like, and also to a method of constructing the same.

Qne object of the invention is the pro vision of a coil which is so constructed that the two terminals are located on the outer surface of the coil and adjacent the middle thereof.

claims.

In the accompanying drawings, Figure l is a view showing in longitudinal section one form of coil embodying my invention. Fig. 2 is a sectional View taken on the line Ill-H of Fig. 1, looking in the direction of the arrow, and showing the direction in which one of the sections of the coil is wound. F i 3 is a sectional view taken on the line H Hl of Fig. 1, looking in the direction of the arrow, and showing the direction in which the other section is wound. Fig. 4: is a view showing in side elevation and partly in section, the coil shown in the preceding views together with one form of lightning arrester applied thereto.

Similar reference characters refer to simi lar parts in each of the several views. I

Referring first to Fig. 1, the coil here shown comprises two sections W and W, the two terminals of each section being brought out at the same end of the section. These two sections are mounted in axial alinement, with the terminal ends in juxtaposition, and are separated by a space 0. As here shown, the sections are mounted on a straight tubular support T of insulating material which is adapted to receive a soft iron core, although I do not desire to limit myself to this particular means for mounting the sections.

The two inner terminals E and E of the sections are electrically connected in the space 0, as shown. in the drawing, so that the outer terminals F and F constitute the actual terminals of the coil as a whole. The sections are so wound, and are so mounted with relation to each other, that when current enters at one terminal F or F and leaves at the other, the magneto-motive forces produced by the two sections are in the same direction. That is, when the sections are mounted in proper relative position, the two sections are wound in opposite directions, as shown by Fig-S52 and 3. This may conveniently be accomplished by winding the two sections in similar manner, that is, in the same direction and with the terminals taken out at the same end, and then placing these sections end to end with their terminal ends in juxtaposition.

with flexible leads if so desired, and these leads, as well as the connected ends E and E, may be wound around the tube T in the space (J, and subsequently protected by cord or other suitable covering.

it will be apparent that the two actual and afiix a new flexible lead if such leads are em loyed.

r coil constructed in accordance with my invention is well adapted to receive a simple 4. The arrester A, shown herein, comprises two overlapping conducting strips 5, S,

the ends of which are embedded in the sectlons W and W respectively between the being preferably in electrical contact with the wire in the outer layer but insulated from the inner layer by the usual insulation on the wire and also by a block B of insulat- The terminals Fand F may be provided.

terminals F and F are located adjacent the sary to unwind one or two turns of the wire,

form of lightning arrester, as shown in Fig.

two outermost layers of wire, each strip ing material. The strips S and S are insulated from each other by a thin block B of insulating material. By properly proportioning the strips and insulation blocks of the arrester, it will be evident that when lightning attempts to traverse the coil 0, it will be shunted from the coil and caused to select the more direct path afforded by the arrester, thereby preventing injury to the coil. It will be noted that the lightning arrester is conveniently and safely carried by the coil in an unobstructing position.

Having thus described my invention, what I claim is:

1. In combination, a single electro-conducting coil comprising two sections similarly wound and each having both terminals at the same end, said sections being mounted in axial alinement and in spaced relation, and arranged so that the terminal ends are in juxtaposition, the inner ends of the two sections being electrically joined, and a continuous core of magnetizable material fixed with relation to said sections and passenters at one outer terminal and leaves at the other magneto-motive forces produced by the two sections are in the same direction, and a continuous core of magnetizable material fixed with relation to said sections and passing through said sections and through the space between the sections.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES W. DUN HAM.

Witnesses A. HERMAN WEGNnR, R. GEORGE RUDMAN. 

